<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>组件实例的三大核心属性：state</title>
  <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <!-- 生产环境中不建议使用 -->
  <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
</head>
<style>

</style>

<body>
  <!-- 容器 -->
  <div id="test"></div>

  <script type="text/babel">
    class Weather extends React.Component {
      constructor(props) {
        super(props)
        // 存在this，就必须有super
        this.state = {
          isHot: false
        }
      }
      render() {
        console.log(this);
        let { isHot } = this.state;
        return <h3>今天天气很{isHot ? '炎热' : '凉快'}</h3>
      }
    }

    ReactDOM.render(<Weather />, document.getElementById("test"))
  </script>

</body>

</html>
